Pressure switch DL manual - add-furnace.com

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Pressure switch for air DL Technical Information · GB

4 Edition 04.18

• Monitoring of air, flue gas and other non-aggressive gases

• High switching point stability

• Switching point selection via hand wheel or adjusting screw

• Screw terminals or AMP plugs for electrical connections

• Flexible mounting options

AGA

https://www.add-furnace.com/


Contents Pressure switch for air DL . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Contents . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . 2

1 Application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

1.1 Application examples ................................................................. 4

1.2 Mounting examples .................................................................... 7

1.2.1 Simple mounting ................................................................................ 7

1.2.2 Mounting without the need for tools or screws .................................. 7

1.2.3 Pressure-resistant mounting on mounting plate ............................... 7

1.2.4 Rugged, locked mounting .................................................................. 8

1.2.5 Mounting directly on the fan motor ................................................... 8

1.2.6 Protection against pressure surges .................................................... 8

1.2.7 Clearer handling in complex installations ........................................... 9

1.2.8 Tube set with diverse possible applications ........................................ 9

1.2.9 Easier diagnosis and maintenance ................................................... 10

2 Certification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

2.1 Overview .......................................................................................... 12

3 Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13

3.1 Positive pressure measurement .............................................. 13

3.1.1 DL 1,5 A: hand wheel setting in the negative range. 13

3.2 Negative pressure measurement ............................................ 13

3.2.1 DL 1,5 A: hand wheel setting in the negative range 13

3.3 Differential pressure measurement ........................................ 13

3.3.1 DL 1,5 A: hand wheel setting in the negative range 14

3.4 Wiring ................................................................................. 15

3.4.1 Increasing pressure control ............................................................. 15

3.4.2 Decreasing pressure control ............................................................ 15

3.4.3 DL 1,5A ........................................................................................... 16

3.5 DL..A, DL..K, DL..T, DL..KT, DL..AT in Zone 1 (21) and 2 (22) hazardous areas ............................................................................... 17

3.6 Animation ................................................................................ 18

4 Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

4.1 DL 3,3 – 40K selection table ................................................ 20

4.1.1 Type code ...................................................................................... 20

4.1.2 Electrical connection ..................................................................... 20

4.2 DL 2 – 35E selection table .................................................... 21

4.2.1 Type code ....................................................................................... 21

4.2.2 Electrical connection ...................................................................... 21

4.2.3 Switching differential/switching point depends on installation position ..................................................................................................... 21

4.3 DL 1,5 – 150A, DL 3 – 150K, DL 10 – 150AH/..

AN, DL 10 – 150KH/..KN selection table ....................................... 22

4.3.1 Type code ....................................................................................... 22

4.3.2 Electrical connection ...................................................................... 22

4.3.3 Test key .......................................................................................... 22

4.4 DL 1 – 50E selection table ....................................................23

4.4.1 Type code ...................................................................................... 23

4.4.2 Electrical connection ..................................................................... 23

4.4.3 Test tapping point .......................................................................... 23

5 Project planning information . . . . . . . . . . . . . . . . . . . . .24

5.1 Pressure switch with NBR diaphragm ........................................ 24

5.2 Installation ......................................................................... 24

5 Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26

5.1 Securing clip S ..................................................................... 26

5.2 Securing clip D .................................................................... 26

5.3 L-angle bracket ................................................................... 26

5.4 Z-angle bracket ................................................................... 27

5.5 U-angle bracket .................................................................. 27

5.6 Tube set ................................................................................... 27

5.7 Pilot lamp set, red or blue ........................................................ 28

5.8 LED set, red/green ................................................................. 28

5.9 Standard socket set ................................................................ 28

5.10 Motor flange adapter ........................................................... 28

5.11 Damping nozzle ................................................................28

5.12 Restrictor orifice .................................................................. 29

DL · Edition 04.18 = To be continued 2


DL · Edition 04.18 3


5.13 Colour coordination set .................................... 29 5.14 External adjustment ......................................... 29 5.15 Pressure equalization element ......................... 29 5.16 Grommet .......................................................... 30

6 Technical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 6.1 DL..K ................................................................... 32

6.1.1 Dimensions DL..K ..................................................... 33 6.1.2 Adjusting range, switching differential DL..K ........... 33

6.2 DL..A, DL..K, DL..AH/..AN, DL..KH/..KN ................. 34 6.2.1 Dimensions DL..A, DL..K, DL..AH/..AN, DL..KH/..KN 35 6.2.2 Adjusting range, switching differential DL..A, DL..K, DL..AH/..AN, DL..KH/..KN ........................................... 36

6.3 DL 1E – DL 50E ............................................... 37 6.3.1 Dimensions DL 1E – DL 50E ................................38 6.3.2 Adjusting range, switching differential DL 1E – DL 50E 38

6.4 DL 2E – DL 35E .............................................. 39 6.4.1 Dimensions DL 2E – DL 35E ................................ 40 6.4.2 Adjusting range, switching differential DL 2E – DL 35E 40

7 Maintenance cycles . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

Feedback . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .42

Contact . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .42




1 Application Pressure switches for air DL can be used as positive

pressure switches, vacuum sensors or differential

pressure switches for air, flue gas and other non-

aggressive gases. They are not suitable for fuel gases.

They monitor extremely low pressure differentials.

They trigger switch-on, switch-off or switch-over

operations if a set switching point is reached. This

switching point can be adjusted using a hand wheel or,

if required, it can be fixed using an adjusting screw.

The diaphragm pressure switch with micro switch

features particularly high contact reliability as low gas

release components are used.

1 .1 Application examples

The switching point can be infinitely adjusted using the

hand wheel.

Filter monitoring in kitchens

DL..K is used in air-conditioning systems and kitchens

due to its low adjusting range (from 20 Pa).

The pneumatic and electrical connections on

DL 3,3 – 40K are accessible from the same side in order

to ensure space-saving and easy-to-fit installation.

DL 3,3 – 40K DL 3K DL 5 – 150K




DL..A, DL..K are used for controlling butterfly valves for

air and fire dampers in firing systems, and for fan moni-

toring.

DL 1,5 A (-0.5 to +1.5 mbar) is used in laboratories and

special applications in particular.

On DL..A, the positive pressure can be connected via a

threaded connection (Rp ¼ ) in the lower housing sec-

tion.

DL..A-3Z with tube connection for negative pressure

also has a threaded connection Rp ¹∕8 for negative pres-

sure. To use the threaded connection, the tube connec-

tion must be unscrewed (minus).

The DL..AH/..HN, DL..KH/..KN can be supplied with

manual reset function and is used, for example, for si-

phon monitoring on heating systems.

Fan monitoring in laboratories

DL 1,5 – 3A, DL 3K DL 5 – 150A, DL 5 – 150K




Thanks to its slim design and low adjusting range (20

to 5000 Pa/0.08 to 20 "WC), the fields of application of

DL..E include fan monitoring on condensing boiler units

or on atmospheric wall-mounted units with flue gas fan.

On request, the air pressure switch DL..E can be sup-

plied with only one NO contact, e.g. for a non-inter-

changeable connection to boiler control systems. Heating boilers connected in cascade

Pressure switch DL mounted on heating boiler

DL 2 – 35E DL 1 – 3E DL 5 – 50E




1 .2 Mounting examples

1 .2 .1 Simple mounting

The securing clip S allows the pressure switch to be eas-

ily installed and removed. Only two holes in the mount-

ing plate or air duct are required for secure mounting.

Securing clip S, see page 26 (Accessories).

1 .2 .3 Pressure-resistant mounting on mounting plate

Simple front mounting. Mounting using two screws

on the same side is usually sufficient and prevents the

pressure switch being subjected to mechanical stress,

see page 24 (Project planning information).

1 .2 .2 Mounting without the need for tools or screws

Attach the D clip to the mounting plate with the two

screws supplied. Simply push the pressure switch onto

the clip. The pressure switch can now be detached

again at any time without the need for tools.

To reduce the amount of assembly work required, the

pressure switch may, on request, be supplied with the

clip already fitted. D clip, see page 26 (Accessories).




1 .2 .4 Rugged, locked mounting 1 .2 .5 Mounting directly on the fan motor

The L-shaped or Z-shaped angle bracket offers diverse

mounting options, even with only one screw, and fast

installation and removal. The angle bracket increases

the distance between the pressure switch and warm

boiler walls. Fastening set, see page 26 (Accesso-

ries).

The pressure switch can be installed in a space-saving

manner using the motor flange adapter. It is not neces-

sary to drill holes for mounting. Motor flange adapter,

see page 26 (Accessories).

1 .2 .6 Protection against pressure surges

The damping nozzle attenuates pressure fluctuations

and pressure surges. A brief pressure surge occurs in

the air supply line when igniting a burner, for example.

Damping nozzle, see page 26 (Accessories).




1 .2 .7 Clearer handling in complex installations

In order to facilitate reading for pressure switches with the

same switching point setting, for example, a scale mark can

be used. The scale mark can simply be clipped on and is

available in different colours as a colour coordination set,

see page 26 (Accessories).

1 .2 .8 Tube set with diverse possible applications

Using the extension, the pressure switch can be used on

insulated and lagged ducts.

Duct connection flanges and angle connectors connect the

pressure switch and pressure test point.

The angle connector reinforces the ∆p signal if it is too low for

the pressure switch adjusting range.

Tube set, see page 26 (Accessories).

Filter pad

Extension

Angle

connector

Flo

w d

irec

tio

n

Flo

w d

irec

tio

n

Flo

w d

irec

tio

n




1 .2 .9 Easier diagnosis and maintenance

Either a red or a blue pilot lamp, or a red-green LED

(24 V/230 V) indicates the switching status of the pres-

sure switch, see page 26 (Accessories).




2 Certification Certificates – see Docuthek

EU certified pursuant to

DL..: AMP plug connection, see page 12 (Overview).

Underwriters Laboratories – www.ul.com Tools (at the

bottom of the page) Online Certifications Directory

UL listed

USA and Canada

Directives:

– Low Voltage Directive (2014/35/EU)

– EMC Directive (2014/30/EU)

Regulation:

- Gas Appliances Regulation (EU) 2016/426

Standards:

– EN 13611:2015+AC:2016

– EN 1854:2010

FM approved

UL 353 Limit control.

DL..: electrical connection via screw terminals, see page

12 (Overview).

Underwriters Laboratories – www.ul.com Tools (at the

bottom of the page) Online Certifications Directory

AGA approved

Factory Mutual Research Class: 3510 Flow and pres-

sure safety switches. Designed for applications pursu-

ant to NFPA 85 and NFPA 86. www.approvalguide.com

UR recognized

USA and Canada

UL 353 Limit control.

Australian Gas Association, Approval No.: 5484 –

http://www.aga.asn.au/product_directory

Eurasian Customs Union

The product DL meets the technical specifications of

the Eurasian Customs Union.

AGA


http://docuthek.kromschroeder.com/documents/index.php?lang=en&selclass=20&folder=311047

http://www.ul.com/

http://www.ul.com/

http://www.approvalguide.com/

http://www.aga.asn.au/product_directory



2 .1 Overview

Type

2014/35/EU

DL 1 – 3E, DL 5 – 50E, DL 2 – 35E, DL 3,3 – 40K, DL 3K, DL 5 – 150K,

DL 1,5 – 3A, DL 5 – 150A

(EU) 2016/426 – GAR


DL 1,5 – 3A, DL 5 – 150A

AGA

DL 1 – 3E, DL 5 – 50E, DL 3A,

DL 5 – 150A, DL 3K, DL 5 – 150K


DL 1,5 – 3A, DL 5 – 150A

DL 1 – 3ET, DL 5 – 50ET, DL 2 – 35ET, DL 3,5 – 40KT-3, DL 3AT, DL 3KT,

DL 5 – 50AT, DL 5 – 50KT

*

DL 3AT, DL 5 – 50AT, DL 3,5 – 40KT-3 (except DL 3,3KT-3/DL 5,1KT-3),

DL 3KT, DL 5 – 50KT

** DL 2 – 35ET, DL 3,5 – 40KT-1 (except DL 3,3KT-1/DL 5,1KT-1),

DL 1 – 3ET, DL 5 – 50ET

* DL..-3 with screw terminals: UL listed. ** DL..-1 with AMP plugs: UR recognized.




3 Function

The air pressure switch DL switches in the event of in-

creasing or decreasing pressure. Once the set switching point

is reached, a micro switch is activated in the DL.

The switching pressure is adjusted against a spring force

using a hand wheel or an adjusting screw.

3 .1 Positive pressure measurement

Positive pressure measurement is designed, for example,

for checking the fan function or measuring the min./max.

pressure.

The positive pressure is measured in the lower diaphragm

chamber, port 1. The upper diaphragm chamber is ventilated

via port 2.

3 .1 .1 DL 1,5 A: hand wheel setting in the negative range

The positive pressure is measured in the upper diaphragm

chamber, port 2. The lower diaphragm chamber is ventilated

via port 1.

3 .2 Negative pressure measurement

Negative pressure measurement is designed, for example, for

checking air locks or the fan function.

The negative pressure is measured in the upper diaphragm

chamber, port 2. The lower diaphragm chamber is ventilated

via port 1.

3 .2 .1 DL 1,5 A: hand wheel setting in the negative range

The negative pressure is measured in the lower diaphragm

chamber, port 1. The upper diaphragm chamber is ventilated

via port 2.

3 .3 Differential pressure measurement Differential

pressure measurement is designed for safeguarding an air

flow rate or for monitoring filters and fans, for instance.

The higher absolute pressure is connected to port 1 and the

lower absolute pressure to port 2. The remaining ports must

be tightly plugged.

Increasing negative pressure Decreasing negative pressure

Increasing pressure

Decreasing pressure

-6 -5 -4 -3 -2 -1 0 1 2 3 4 5 6

Adjusting screw

NONC COM

2

1

Micro switch

Hand wheel M16 x 1.5

Micro switch NO NC

COM

2 1




3 .3 .1 DL 1,5 A: hand wheel setting in the negative

range

The higher absolute pressure is connected to port 2 and

the lower absolute pressure to port 1. The remaining

ports must be tightly plugged.




3 .4 Wiring

When using silicone tubes, only use silicone tubes which

have been sufficiently cured. Vapours containing sili-

cone can adversely affect the functioning of electrical

contacts. In the case of low switching capacities, such

as 24 V, 8 mA, for example, we recommend using an

RC module (22 Ω, 1 μF) in air containing silicone or oil.

In the case of high humidity or aggressive gas com-

ponents, we recommend using a pressure switch with

gold contact due to its higher resistance to corrosion.

Closed-circuit current monitoring is recommended un-

der difficult operating conditions.

3 .4 .1 Increasing pressure control

When the set switching point is reached, the contact

closes from COM 3 to NO 2. Contact COM 3 to NC 1 is

opened. With the NO contact, the NC contact is omit-

ted.

3 .4 .2 Decreasing pressure control

When the set switching point is reached, the contact

closes from COM 3 to NC 1. Contact COM 3 to NO 2 is

opened. With the NO contact, the NC contact is omit-

ted.

1 NO

2 NC

1

COM

3

2 NC NO

3 COM

0

C = 1 µF R = 22

NO

2 NC

1

COM

3

1 NO

2 NC

1

COM

3

2 NC NO

3 COM

0




3 .4 .3 DL 1,5A

The connection of DL 1,5A depends on the positive or

negative adjusting range.

In the positive adjusting range, remove the template

and wire the unit as shown in the engraved connection

diagram.

In the negative adjusting range, the template which can

be found in the unit displays the connection diagram.

3 COM

1 NC

2 NO NC 1

NO 2

N 3

COM

µ

DL 1,5A

NO

2 NC

1

COM

3

= , 2




3 .5 DL . .A, DL . .K, DL . .T, DL . .KT, DL . .AT in

Zone 1 (21) and 2 (22) hazardous areas

Pressure switch DL can be used in Zone 1 (21) and

2 (22) hazardous areas if an isolating amplifier is in-

stalled upstream in the safe area as “Ex-i” equipment

pursuant to EN 60079-11:2012 (VDE 0170-7).

DL as “simple electrical equipment” pursuant to

EN 60079-11:2012, Section 5.7, corresponds to the

Temperature class T6, Group II. The internal inductance/

capacitance is Li = 0.2 µH/Ci = 8 pF.

The isolating amplifier transfers the DL’s signals from

the explosion-hazard area to the safe area. Depending

on the design of the intrinsically safe circuit, the explo-

sion-hazard area can be monitored for cable faults, ca-

ble discontinuities or short-circuits.

Ensure that standard-compliant wiring pursuant to

EN 60079 is used.

When operating in Zones 21 and 22, the ⅛" connecting

thread or the tube connection for the surrounding air or

medium connection must be protected from dirt parti-

cles by a separate filter.

Intrinsically safe circuit without monitoring for cable

faults

Intrinsically safe circuit with monitoring for cable

discontinuities

Intrinsically safe circuit with monitoring for cable

faults and short-circuits

Isolating amplifier

1+

2+

3 –

Safe area

DL

NO

10 k

COM

Zone 1 or 2

DL

NO

COM

Zone 1 or 2

Isolating amplifier

1+

2+

3 –

Safe area

DL

NO

10 kΩ

COM 400 Ω ≤ R ≤ 2 kΩ

Zone 1 or 2

Isolating amplifier

1+

2+

3 –

Safe area




Function

3 .6 Animation

The interactive animation shows the function of the air

pressure switch DL..A.

Click on the picture . The animation can be controlled using

the control bar at the bottom of the window (as on a DVD

player).

To play the animation, you will need Adobe Reader 7 or a newer

version. If you do not have Adobe Reader on your system, you

can download it from the Internet. If the animation does not

start to play, you can download it from the document library

(Docuthek) as an independ- ent application.


http://docuthek.kromschroeder.com/doclib/main.php?language=1&folderid=204030&by_class=7&by_lang=-1

[IP]

DL 5

– 50

E

DL 1

– 3E

DL 1

0 –150KH

/..KN

DL 5

–150K

DL 3K

DL 1

0 –150A

H/..AN

DL 5

–150A

DL 1,5 –3A

DL 2

– 35

E

DL 3,3 – 4

0K

Type

Air-conditioning systems and kitchens Frequent

application

Condensing boilers

Laboratories, industrial firing systems, butterfly valves for air and fire dampers

O

O

O

O

O

O

O

O

Adjusting range in Pascal

Version

Adjusting range in mbar

Hand wheel

Adjusting screw

Screw terminals

O AMP plugs

Tube connection

Threaded connection

O

O

O

O

O

O

O Pilot lamp/Pilot LED

O

O

O

O

O

O

O Standard socket set

Test key in lower chamber

O

O

Test key in upper chamber

O Measuring instrument/pressure signal connection

O

O Securing clip S

Mounting

O

O Securing clip D

O

O L-angle bracket

O

O

O

O

O

O

O Z-angle bracket

O

O

O

O

O

O

O

O

U-angle bracket

O

O

O

O

O

O

External adjustment

Accessories

O

O

O

O

O

O

O

O

O

O Tube set

O

O

O

O

O

O

O

O

O

O Motor flange adapter

10

/21

10

/21

54

54

54

54

54

54

10

/21

54

Standard

Enclosure

44

44

65

65

65

65

65

65

44

54

Maximum*

Sele

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n

4 Selection

= sta

nd

ard

, O = a

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ition

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.18

1

9



4 .1 DL 3,3 – 40K selection table

1) Not available as a T-product. 2) DL..KT-1 with AMP plugs: UR recognized. 3) DL..KT-3 with screw terminals: UL listed.

= standard, O = available

4 .1 .1 Type code

Code Description

DL Pressure switch for air

3,3

Adjusting range 20 – 330 Pa

3,5 30 – 350 Pa 4,5 30 – 500 Pa 5,1 100 – 510 Pa 8 50 – 800 Pa 11 100 – 1100 Pa 16 400 – 1600 Pa 24 200 – 2400 Pa 40 500 – 4000 Pa

K Tube connection and hand wheel for adjustment

T T-product

G Gold contacts -1 AMP plug connection -3 Electrical connection via screw terminals K2 Red/green pilot LED, 24 V DC/AC N Blue pilot lamp, 120 V AC T Blue pilot lamp, 230 V AC T2 Red/green pilot LED, 230 V AC

W Z-angle bracket

Switching point and switching differential, see page

33 (Adjusting range, switching differential DL..K).

4 .1 .2 Electrical connection

DL..K-1 for wiring with AMP plugs

DL..K-3 for wiring via screw terminals

Order example

DL 8KG-3

Type 3,31) 3,5 4,5 5,11) 8 11 16 24 40 K T G -12) -33) K2 N T T2 W

DL O O O O O O




4 .2 DL 2 – 35E selection table

1) Switching point 20 – 30 Pa when installed upside down.


4 .2 .1 Type code

Code Description


21)

41)

14 35

Adjusting range 20 – 200 Pa 50 – 400 Pa

300 – 1400 Pa 1200 – 3500 Pa

EH E

With flat plugs, tube connection, adjusting screw, -40 to +110°C

-20 to +85°C

T T-product

G Gold contacts

-1 AMP plug connection

W Z-angle bracket

1) Adjusting range: DL..2EH: 45 – 200 Pa, DL..4EH: 70 – 400 Pa.

Switching point and switching differential, see pa-

ge 40 (Adjusting range, switching differential DL

2E – DL 35E).

Order example

DL 4EHG-1


Wiring with AMP plugs

4 .2 .3 Switchingdifferential/switchingpoint dependson

installation position

s

Installation upside down or

in the vertical position only

0 20 30 43 50 100

Switching point range [Pa]

30

20

10

0

In

tallation in the

Any installation

position ve rtical position

Installation upside

down only

Po

ssib

le s

witch

ing d

iffere

ntia

l [P

a]

Type 21) 4 14 35 EH E T G -1 W

DL O O




4 .3 DL 1,5 – 150A, DL 3 – 150K, DL 10 – 150AH/ . .AN, DL 10 – 150KH/ . .KN selection table

Type 1,51)2) 3 5 10 30 50 1502) K A T H6) N6) G -33) -43) -53) -63) -93) K2 T T2 N P4) 15) 25) A W

DL O O O O O O O O O O O

1) Only available as DL..A. 2) Not available as a T-product. 3) DL..KT-3 with screw terminals: UL listed. 4) Only for DL 5 – 150K. 5) Only for DL 5 – 150A. 6) Only for DL..10, ..50, ..150.

4 .3 .1 Type code

= standard, O = available Order example

DL 150K-3T


36 (Adjusting range, switching differential DL..A,

DL..K, DL..AH/..AN, DL..KH/..KN).


Wiring via screw terminals

4 .3 .3 Test key

1) Adjusting range: DL..3AT: 0.3 – 3 mbar, DL 5AT and DL 5KT: 0.5 – 5 mbar.

DL 5 – 150A..1: test key in lower chamber (+) or

DL 5 – 150A..2: test key in lower chamber (+) and upper

chamber (-).

Test (-)

Test (+)

Code Description DL Pressure switch for air

1,5 31)

51)

10 30 50 150

Adjusting range -0.5 – 1.5 mbar

0.2 – 3 mbar 0.4 – 5 mbar 1 – 10 mbar

2.5 – 30 mbar 2.5 – 50 mbar

30 – 150 mbar K A

With tube connection and hand wheel Additionally with Rp¼ (NPT¼ ) connection(optional: Rp 1⅛ (NPT⅛))

T T-product H N

Locks off with rising pressure Locks off with falling pressure

G Gold contacts

-3 Electrical connection

via screw terminals via screw terminals, IP 65

with 4-pin plug, without socket with 4-pin plug, with socket

with 4-pin plug, with socket, IP 65

-4 -5 -6 -9 K2 Red/green pilot LED, 24 V DC/AC T Blue pilot lamp, 230 V AC T2 Red/green pilot LED, 230 V AC N Blue pilot lamp, 120 V AC P With test tapping point 1 With 1 test key (lower chamber +) 2 With 2 test keys (upper chamber -, lower chamber +) A External adjustment W Z-angle bracket




4 .4 DL 1 – 50E selection table

Type 1 3 5 10 50 E T G -11) P W

DL O

1) DL..ET with AMP plugs: UR recognized.


4 .4 .1 Type code

Code Description


1 3 51)

10 50

Adjusting range 0.2 – 1 mbar 0.3 – 3 mbar 0.4 – 5 mbar

1.0 – 10 mbar 2.5 – 50 mbar

E With flat plugs, tube connection, adjusting screw

T T-product

G Gold contacts

-1 AMP plug connection

P With test tapping point

W Z-angle bracket 1) DL..5ET: adjusting range 0.5 – 5 mbar.


38 (Adjusting range, switching differential DL 1E – DL

50E).

Order example

DL 50EG-1


DL..E-1 for wiring with AMP plugs

4 .4 .3 Test tapping point

DL 5 – 50E-1P: a measuring instrument can be con-

nected to port 3 or the boiler pressure can be queried.

If port 3 is used for pressure measurement, the sealing

cap must be transferred from port 3 to 1.

1

3




5 Project planning information

5 .1 Pressure switch with NBR diaphragm

Continuous operation at high temperatures (e.g. maxi-

mum ambient temperature) accelerates the ageing of

elastomer materials and reduces the service life (please

contact manufacturer). Ozone concentrations exceed-

ing 200 µg/m3 accelerate the ageing of elastomer ma-

terials and reduce the service life.

5 .2 Installation

Protect the connections against dirt or moisture in the

medium to be measured or the surrounding air. If nec-

essary, install a filter.

When installing outdoors, place the DL in a roofed

area and protect from direct sunlight (even IP 65 ver-

sion). To avoid condensation, the cover with pressure

equalization element can be used on some types, see

page 29 (Pressure equalization element).

In case of highly fluctuating pressures, install a damp-

ing nozzle or restrictor orifice, see pages 28 (Damp-

ing nozzle) and 29 (Restrictor orifice).

In the case of an uneven mounting surface, secure the

pressure switch to the mounting plate or air duct with

only two screws on the same side in order to avoid sub-

jecting the pressure switch to mechanical stress.

For attachment to a mounting plate using self-tapping

screws for plastic, note the specified screw length.

Longer screws can cause damage in the pressure

switch. Specifications for screw length, see page 35

(Dimensions DL..A, DL..K, DL..AH/..AN, DL..KH/..KN)

and page38 (Dimensions DL 1E – DL 50E).

Installation position

Condensation must not be allowed to get into the

housing (if possible, install pipework with an ascending

gradient). Otherwise, there is a risk of icing of conden-

sation at subzero temperatures, the switching point

shifting or corrosion in the device which can lead to

malfunctions.




Installation in the vertical or horizontal position, or up-

side down, preferably with vertical diaphragm.

If installed in a vertical position, the switching point pS

will correspond to the scale value SK. If installed in an-

other position, the switching point pS will change and

no longer correspond to the set scale value SK. Switch-

ing point pS must be checked.

ps = SK SK + 18 Pa

[+ 0.071 "WC] SK - 18 Pa

[- 0.071 "WC]

DL 1E, DL 3E

NB

R

DL 5E, DL 10E, DL 50E

ps = SK SK + 0,18 mbar

[+ 0.071 "WC] SK - 0,18 mbar [- 0.071 "WC]

DL 1,5A

e.g. SK = -0.5:

ps = -0.5 + 0.18

ps = -0.32 mbar

NB

R

DL 3K,

DL 3A

DL

5–150A,

DL 5–

150K

ps = SK SK + 13 Pa

[+ 0.052 "WC] SK - 13 Pa

[- 0.052 "WC]

DL 3,3 – 40K

LS

R

DL 2 – 35E




6 Accessories

6 .1 Securing clip S

For attachment to the three other sides, blue clip, Order No.:

74921512.

6 .3 L-angle bracket

For DL 2 – 35E and DL 3,3 – 40K:

Only two holes in the mounting plate or air duct are re-

quired for secure mounting. Order No.: 34335764.

6 .2 Securing clip D

For DL 2 – 35E and DL 3,3 – 40K: shape A,

Order No.: 74919825.

For pressure-resistant mounting, the D clip is fitted to the

mounting plate from the front or from the back. Simply push

the pressure switch onto the clip.

For DL 2 – 35E, DL 3,3 – 40K:

For attachment to the side of the pressure port, white clip,

Order No.: 74921513.

For DL 2 – 35E and DL 3,3 – 40K: shape B,

Order No.: 74921466.

0,8 – 1,1 (0.03 – 0.043")

ø 5,8 (0.23")

ø 3,0 mm (0.12")

ø 4,3 (0.17") ø 3,1

(0.12")

ø 3,5 ±0,1

(0.14 ±0.004")

56

(2

.2")

34

(1

3.3

8")

48

(1

8.9

")

17

1

5

(0.5

9")

(0

.67

")




6 .4 Z-angle bracket For DL 1,5 – 150A, DL 3 – 150K, DL 1 – 50E:

Order No.: 74916185.

6 .6Tube set

For DL 2 – 35E and DL 3,3 – 40K: Order No.: 74919824,

DL 5 – 50E and DL 5 – 150K: Order No.: 74916158,

DL 3 – 150A, DL 3K and DL 1 – 3E: Order No.: 74913661.

6 .5 U-angle bracket

Tube set, including angle connectors and extension:

Order No.: 74919272.

Tube set with 2 m PVC tube, 2 duct connection flanges

with screws, R ¼ and R ¹/8 connecting nipples:

Order No.: 74912952.

1 (0.04")

10 (0.39")

40 (1.6")

59 (2.3")

ø 4,2 (0.17")

ø 5,5 (0.22")

ø 6 (0.22")

50 (1.97")

30 (1.18")

45 (1.77")

25 (0.98") M4 x 12

M4 x 10

24 (0.94")

43 -0,3 (1.69")

64 (2.52")

6 (

0.2

4")

16

(0.6

3")

7,5

(0

.3")

4,2

0 +

0,1

(0.1

7")

5,2

(0.2

")

39 (

1.5

3")

10

(0.4

")

7 (

0.2

7")

11,3

(0.4

4")

40

(1.5

7")




6 .7 Pilot lamp set, red or blue

For DL..K and DL..A

6 .9 Standard socket set

Pilot lamp, red:

110/120 V AC, I = 1.2 mA, Order No.: 74920430,

220/250 V AC, I = 0.6 mA, Order No.: 74920429.

Pilot lamp, blue:

110/120 V AC, I = 1.2 mA, Order No.: 74916121,

220/250 V AC, I = 0.6 mA, Order No.: 74916122.

6 .8 LED set, red/green

For DL..K and DL..A

DL..A, DL..K: Order No.: 74916159.

6 .10 Motor flange adapter

DL 5 – 50E, Order No.: 74916149,

DL 1 – 3E, DL 3 – 150A, DL 3 – 5K, Order No.: 74916157,

DL 5 – 150K, Order No.: 74916156,

DL 2/4/14/35E, DL 3,5/4,5/8/16/24/40K,

Order No.: 74920415.

6 .11 Damping nozzle

24 V DC, I = 16 mA; 24 V AC, I = 8 mA, Order No.:

74921089,

230 V AC, I = 0.6 mA, Order No.: 74923275.

In the case of high pressure fluctuations, we recom-

mend using a damping nozzle for tube connections:

Ø = 0.8 mm (0.03"), Order No.: 35451346.




6 .12 Restrictor orifice 6 .15 Pressure equalization element

In the case of high pressure fluctuations, we recommend

using a restrictor orifice (contains non-ferrous metals) for

Rp ¼ threaded connections:

Hole diameter 0.2 mm, Order No.: 75456321, hole

diameter 0.3 mm, Order No.: 75441317.

6 .13 Colour coordination set

To avoid the formation of condensation, the cover with

pressure equalization element can be used. The diaphragm

in the screw connector is designed to ventilate the cover,

without allowing water to enter.

Order No.: 74923391.

The scale mark is available in each case as a 5-piece set.

Colour coordination set, blue, Order No.: 74921726, Colour

coordination set, yellow, Order No.: 74921727.

6 .14 External adjustment

In order to set the switching pressure from the outside, the

cover for external adjustment (6 mm Allen key) for DL 1,5 –

150A, DL 3 – 150K can be retrofitted.

Order No.: 74916155.

Rp¼




6 .16 Grommet

Grommet for enclosure IP 44.

DL 2/4/14/35E: Order No.: 34919801.


DL 1/3/5/10/50E: Order No.: 34328197.


DL 1/3/5/10/50E: Order No.: 34330703.




7 Technical data Gas types: air or flue gas, no flammable gases, no ag-

gressive gases.

Micro switch to EN 61058-1,

Switching capacity:

U cos =1 cos = 0.6

DL 24 – 250 V AC 0.05 – 5 A 0.05 – 1 A

DL..G 5 – 250 V AC 0.01 – 5 A 0.01 – 1 A

5 – 48 V DC 0,01 – 1 A

DL..T 30 – 240 V AC 5 A 0.5 A

DL..TG < 30 V AC/DC 0.1 A 0.05 A

If the DL..G (DL..TG) has switched a voltage > 24 V

(> 30 V) and a current > 0.1 A at cos = 1 or > 0.05 A at

cos = 0.6 once, the gold plating on the contacts will

have been burnt through. It can then only be operated

at this power rating or higher power rating.

Contact gap < 3 mm (μ).

Safety class II to VDE 0106-1.




7 .1 DL . .K

Enclosure to IEC 60529: IP 54.

Diaphragm pressure switch, tempered LSR diaphragm

system.

Housing: glass fibre reinforced PBT plastic with low gas

release.

Max. inlet pressure pmax. = withstand pressure: 5 kPa,

differential pressure: 5 kPa.

Permitted ambient temperature in operation:

DL..K: -20 to +85°C (-4 to +185°F),

DL..KT: -40 to +60°C (-40 to +140°F).

Storage and transport temperature:

-20 to +40°C (-4 to +104°F).

Line diameter: 0.5 to 1.8 mm (AWG 24 to AWG 13).

Line entrance: M16 x 1.5, clamping range:

diameters of 4 to 10 mm.

Electrical connection type: screw terminals.

Recommended tightening torque:

Weight: 125 g (4.4 oz).

Component Tightening torque [Ncm]

Cover screw 60

M16 x 1.5 cable gland 50

Clamping terminal screws 80




7 .1 .1 Dimensions DL . .K

7 .1 .2 Adjusting range, switching differential DL . .K

Type

Adjusting range Mean switching differential at min.

and max. setting

Deviation from the switching point during testing pursuant to EN 1854 or by agreement Pa "WC Pa "WC

min. max. min. max. min. max. min. max.

DL 3,3K 20 330 8 20

DL 3,5K, DL 3,5KT 30 350 0.12 1.4 10 20 0.04 0.08

DL 4,5K, DL 4,5KT 30 500 0.12 2 12 25 0.05 0.10

DL 5,1 K 100 510 15 30

DL 8K, DL 8KT 50 800 0.20 3.2 17 30 0.07 0.12

DL 11K, DL 11KT 100 1100 0.4 4.4 20 35 0.08 0.14

DL 16K, DL 16KT 400 1600 1.6 6.4 30 40 0.12 0.16

DL 24K, DL 24KT 200 2400 0.8 9.6 45 55 0.18 0.22 ± 40 P

DL 40K, DL 40KT 500 4000 2.0 16.0 70 90 0.28 0.36

ø 6,1 (ø 0.24")

89 (3.5")

66 (2.6")

47 (1.9") 4,4 (0.14")

10,2 (0.4")

85 (3.35")

M16 x 1,5 (½" NPT Conduit)




7 .2 DL . .A, DL . .K, DL . .AH/ . .AN, DL . .KH/ . .KN

Diaphragm pressure switch, silicone-free.

Enclosure to IEC 60529: IP 54, IP 65.

Diaphragm: NBR.

Max. inlet pressure pmax. = withstand pressure,

differential pressure: see table.


DL..A, DL..K:

-20 to +80°C (-4 to +176°F),

DL..AH/..AN, DL..KH/..KN:

-15 to +60 °C (+5 to + 140 °F)

DL..T:

-40 to +60°C (-40 to +140°F).

Long-term use in the upper ambient temperature range

accelerates the ageing of the elastomer materials and

reduces the service life (please contact manufacturer).


-20 to +40°C (-4 to +104°F).

Line diameter: 0.5 to 1.8 mm (AWG 24 to AWG 13).

Line entrance: M16 x 1.5, clamping range: diameters of

4 to 10 mm.

Weight:

approx. 200 g (7 oz).

Electrical connection type: screw terminals.



Cover screws 65

M16 x 1.5 cable gland 50

Rp ¼ air connection 600

Rp ⅛ air connection, switch housing 250

Clamping terminal screws 80




7 .2 .1 Dimensions DL . .A, DL . .K, DL . .AH/ . .AN, DL . .KH/ . .KN

* optional

For 1 mm thick mounting plates, use self-tapping screws for plastic:

DL..A, DL..3K = Ø 3.5 x 8 mm or Ø 4 x 8 mm,

DL 5 – 150K = Ø 3.5 x 16 mm, see page 24 (Project planning information), Installation.

63 (2.5")

53 (2.1")

ø 6,1 (ø 0.24") ø 3,5 x 8 (ø 0.14" x 0.3")

ø 6,1 (ø 0.24") 49,5 (1.9")

ø 2,7 x 16 (ø 0.11" x 0.6) 54,5 (2.1")

DL..A: Rp ¼ (DL..AT: ¼ " NPT)

ø 2,7 x 8 (ø 0.11" x 0.3") 44,5 (1.7") 64 (2.5") 45 (1.8")

76 (3") 76 (3")

DL..A: Rp ¹⁄g

(DL..AT: ¹⁄g" NPT) 28,5 (1.1") 28,5 (1.1")

M16 x 1,5 M16 x 1,5 (½ " NPT Conduit) (½ " NPT Conduit)

DL 5A – 150A, DL 10AH/..AN – 150AH/..AN DL 5K – 150K, DL 10KH/..KN – 150KH/..KN

68 (2.7")

49,5 (1.9")

44,5 (1.7") DL..A: Rp ¼ (DL..AT: ¼ " NPT)

59 (2.3")

ø 2,7 x 8 (0.11" x 0.3")

ø 6,1 (ø 0.24")

107 (4.2") 107 (4.2")

DL..A: Rp ¹⁄g* (DL..AT: ¹⁄g" NPT)*

ø 3,5 x 8 (0.14" x 0.3")

28,5 (1.1")

M16 x 1,5 (½ " NPT Conduit)

DL 1,5A, DL 3A DL 1,5A, DL 3A, DL 3K DL 3K




7 .2 .2 Adjusting range, switching differential DL . .A, DL . .K, DL . .AH/ . .AN, DL . .KH/ . .KN

Type

Adjusting range (adjusting tolerance ± 15% of the

scale value, but min. ± 8 Pa)

Max. inlet pressure = withstand pressure

Mean switching differential at min. and

max. setting

Deviation from the switching point during testing pursuant to EN 1854

Air pressure switches mbar "WC mbar

"WC

mbar "WC


DL 1,5A -0.5 1.5 50 0.1 0.16

DL 3A, DL 3K 0.2 3 0.08 1.2 50 20 0.1 0.16 0.04 0.06

DL 3AT, DL 3KT 0.3 3 0.12 1.2 150 58.5 0.1 0.16 0.04 0.06

DL 5A, DL 5K 0.4 5 300 0.2 0.3 ± 15 oder ± 4 Pa

DL 5AT, DL 5KT 0.5 5 0.2 2 300 117 0.2 0.3 0.08 0.12

DL 10A, DL 10KT, DL 10A, DL 10KT 1 10 0.4 4 300 117 0.25 0.4 0.1 0.16

DL 30A, DL 30K 2.5 30 300 0.35 0.9 ± 15 or ± 4 Pa

DL 50A, DL 50K, DL 50AT, DL 50KT 2.5 50 1 20 300 117 0.8 1.5 0.3 0.6

DL 150A, DL 150K 30 150 300 3 5

Type

Adjusting range*

Mean switching

differential at min. and max. setting

Max. inlet pressure pmax. =

withstand pressure

Difference between

switching pressure and possible reset

Deviation from the switching point during testing pursuant to

EN 1854

Gas pressure switch

Air pressure switch mbar "WC mbar "WC mbar "WC mbar "WC

DL 10AH, DL 10AN, DL 10KH,DL 10KN 1 – 10 0.4 – 4 – – 300 117 0.4 – 1 0.16 – 0.4

DL 50AH, DL 50AH DL 50KH, DL 50KN 2.5 – 50 1 – 20 – – 300 117 1 – 2 0.4 – 0.8

DL 150AH, DL 150AH DL 150KH, DL 150KN 30 – 150 12 – 60 – – 300 117 2 – 5 0.8 – 2

* Adjusting tolerance = ± 15% of the scale value.




7 .3 DL 1E – DL 50E

Enclosure to IEC 60529:

IP 10 = any installation position,

IP 21 = electrical connection from below,

IP 42/44 = with cable grommet, see page 26 (Acces-

sories).

Diaphragm: NBR.




-20 to +80°C (-4 to +176°F),

DL..T: -40 to +60°C (-40 to +140°F).

Long-term use in the upper ambient temperature range

accelerates the ageing of the elastomer materials and

reduces the service life (please contact manufacturer).


-20 to +40°C (-4 to +104°F).

Weight:

approx. 130 g (4.5 oz).



Cover screw 50

Strain relief facility 60




7 .3 .1 Dimensions DL 1E – DL 50E

For 1 mm thick mounting plates, use self-tapping screws for plastic:

DL 1 – 3E: Ø 3.5 x 8 mm or Ø 4 x 8 mm,

DL 5 – 50E: Ø 3.5 x 16 mm or M4, see page 24 (Project planning information), Installation.

7 .3 .2 Adjusting range, switching differential DL 1E – DL 50E

Type

Adjusting range (adjusting tolerance ± 15% of the

scale value)

Max. inlet pressure = withstand

pressure

Mean switching differential at min. and max. setting or by agreement

Deviation from the switching point during

testing pursuant to EN 1854 Air pressure switches mbar "WC

mbar "WC mbar "WC


DL 1E, DL 1ET 0.2 1 0.08 0.4 50 20 0.1 0.15 0.04 0.06

DL 3E, DL 3ET 0.3 3 0.12 1.2 50 20 0.2 0.3 0.08 0.12

DL 5E 0.4 5 300 0.25 0.4

DL 5ET 0.5 5 0.2 2 300 117 0.25 0.4 0.01 0.16

DL 10E, DL 10ET 1 10 0.4 4 300 117 0.3 0.4 0.12 0.16

DL 50E, DL 50ET 2.5 50 1 20 300 117 0.5 1.3 0.2 0.5

70 (2.7") ø 2,7 x 8 (ø 0.11" x 0.3")

49,5 (1.9") 41 (1.6") ø 2,7 x 16

(ø 0.1" x 0.6")

64 (2.5")

ø 6,1 (ø 0.24")

107 (4.2")

76 (3") 45 (1.8")

5,85 (0.2")

ø 3,5 x 8 44,5 (1.7") (ø 0.14" x 0.3)

DL 1E, DL 3E

ø 4,2 (ø 0.16")

DL 5E-1P, DL 10E-1P, DL 50E-1P

5,85 (0.2")

53,7 (2.1") ø 5,1 x 8

61,5 (2.4") (ø 0.20" x 0.3")




7 .4 DL 2E – DL 35E

Enclosure to IEC 60529:

IP 00 = without cover,

IP 10 = any installation position with cover,

IP 21 = opening in cover points downwards,

IP 42/44 = cover with cable grommet.

Diaphragm pressure switch, tempered LSR diaphragm

system.

Housing: glass fibre reinforced PBT plastic with low gas

release.




DL..E: -20 to +85°C (-4 to +185°F),

DL..EH: -40 to +110°C (-40 to +230°F),

DL..T: -40 to +60°C (-40 to +140°F).


DL..E, DL..T: -20 to +40°C (-4 to +104°F),

DL..EH: -20 to +60°C (-4 to +140°F).

Weight: approx. 80 g (2.3 oz).



Cover screw 65

Strain relief facility 65




7 .4 .1 Dimensions DL 2E – DL 35E

7 .4 .2 Adjusting range, switching differential DL 2E – DL 35E

Type

Adjusting range (adjusting tolerance ± 15% of the scale

value, but min. ± 10 Pa [± 0.04 "WC])

Max. inlet pressure = withstand pressure

Mean switching differential at min. and max. setting or by agreement

Deviation from the switching point

during testing pursuant to EN 1854 Air pressure switches

Pa "WC Pa

psig

Pa "WC


DL 2E, DL 2ET 20 200 0.12 0.8 5000 0.7 15 25 0.05 0.10

DL 2EH 45 200 1500 15 25

DL 4E, DL 4ET 50 400 0.2 1.6 5000 0.7 20 50 0.08 0.20 /min. ± 8 Pa [± 0.03 "WC]

DL 4EH 70 400 1500 20 50

DL 14E, DL 14ET 300 1400 1.20 5.6 5000 0.7 30 60 0.12 0.24

DL 35E, DL 35ET 1200 3500 4.8 14.1 5000 0.7 60 100 0.24 0.40 "WC]

89 (3.5")

66 (2.6")

42 (1.7") 4,4 (0.14")

10,2

(0.4")

85 (3.35")

ø 6,1 (ø 0.24")




8 Maintenance cycles We recommend a function check once a year.

C

The current addresses of our international agents are available on the Internet: www.kromschroeder.de/Weltweit.20.0.html?&L=1

We reserve the right to make technical modifications in the interests of progress. Copyright © 2018 Elster GmbH All rights reserved.

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Pressure switch DL manual - add-furnace.com